Here are the current CephFS features and first release they came out:
-+------------------+--------------+-----------------+
-| Feature | Ceph release | Upstream Kernel |
-+==================+==============+=================+
-| jewel | jewel | 4.5 |
-+------------------+--------------+-----------------+
-| kraken | kraken | 4.13 |
-+------------------+--------------+-----------------+
-| luminous | luminous | 4.13 |
-+------------------+--------------+-----------------+
-| mimic | mimic | 4.19 |
-+------------------+--------------+-----------------+
-| reply_encoding | nautilus | 5.1 |
-+------------------+--------------+-----------------+
-| reclaim_client | nautilus | N/A |
-+------------------+--------------+-----------------+
-| lazy_caps_wanted | nautilus | 5.1 |
-+------------------+--------------+-----------------+
-| multi_reconnect | nautilus | 5.1 |
-+------------------+--------------+-----------------+
-| deleg_ino | octopus | 5.6 |
-+------------------+--------------+-----------------+
-| metric_collect | pacific | N/A |
-+------------------+--------------+-----------------+
-| alternate_name | pacific | PLANNED |
-+------------------+--------------+-----------------+
++----------------------------+--------------+-----------------+
+| Feature | Ceph release | Upstream Kernel |
++============================+==============+=================+
+| jewel | jewel | 4.5 |
++----------------------------+--------------+-----------------+
+| kraken | kraken | 4.13 |
++----------------------------+--------------+-----------------+
+| luminous | luminous | 4.13 |
++----------------------------+--------------+-----------------+
+| mimic | mimic | 4.19 |
++----------------------------+--------------+-----------------+
+| reply_encoding | nautilus | 5.1 |
++----------------------------+--------------+-----------------+
+| reclaim_client | nautilus | N/A |
++----------------------------+--------------+-----------------+
+| lazy_caps_wanted | nautilus | 5.1 |
++----------------------------+--------------+-----------------+
+| multi_reconnect | nautilus | 5.1 |
++----------------------------+--------------+-----------------+
+| deleg_ino | octopus | 5.6 |
++----------------------------+--------------+-----------------+
+| metric_collect | pacific | N/A |
++----------------------------+--------------+-----------------+
+| alternate_name | pacific | 6.5 |
++----------------------------+--------------+-----------------+
+| notify_session_state | quincy | 5.19 |
++----------------------------+--------------+-----------------+
+| op_getvxattr | quincy | 6.0 |
++----------------------------+--------------+-----------------+
+| 32bits_retry_fwd | reef | 6.6 |
++----------------------------+--------------+-----------------+
+| new_snaprealm_info | reef | UNKNOWN |
++----------------------------+--------------+-----------------+
+| has_owner_uidgid | reef | 6.6 |
++----------------------------+--------------+-----------------+
+
+..
+ Comment: use `git describe --tags --abbrev=0 <commit>` to lookup release
+
CephFS Feature Descriptions