10 Without write access, the ctime cannot be changed.
13 > touch: cannot touch `a': Permission denied
15 With write access, the ctime can be set to the current time, but not to
18 $ nfs4acl --set 'bin:rw::allow' a
22 $ [ b -ot a ] || echo 'b should be older than a'
24 > touch: setting times of `a': Operation not permitted
26 With set_attributes access, the ctime can be set to an arbitrary time:
28 $ nfs4acl --set 'bin:rwt::allow' a
32 $ [ b -ot a -o a -ot b ] && echo 'a should be as old as b'