```console rr-@tornado:~/test_gocryptfs_mountpoint$ touch test_file rr-@tornado:~/test_gocryptfs_mountpoint$ attr -s key -V value test_file attr_set: Operation not supported rr-@tornado:~/test_gocryptfs_mountpoint$ setfattr -n key -v value test_file setfattr: test_file: Operation not supported ``` :( For a good start, these don't even need to be encrypted (as long as it's mentioned in the manpage).