ceph-fuse: add dedicated snap stag map for each directory
This will fix the fino colliding bug, which is caused when the
snapid is later than 0xffff.
From mds 'mds_max_snaps_per_dir' option, we can see that the max
snapshots for each directory is 4_K, and in ceph-fuse we have
around 64_K, which is from 0xffff - 2, stags could be used to make
the fake fuse inode numbers for each directory.
Fixes: https://tracker.ceph.com/issues/54653 Signed-off-by: Xiubo Li <xiubli@redhat.com>
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