Ceph » CephFS

Ceph: v10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374)
Linux Kernel: 4.6.3-300.fc24.x86_64

Hello,

When trying to mount a cephfs with the rbytes or norbytes mount option, I'm getting the following output:

mount.ceph CEPH_HOSTS:6789:/ /mnt/test -v -o name=admin,secretfile=/etc/ceph/ceph.client.admin.key,norbytes
parsing options: name=admin,secretfile=/etc/ceph/ceph.client.admin.key,norbytes
ceph: Unknown mount option norbytes

(The output for the rbytes option says the same except different option name)

The mount options (norbytes and rbytes) are documented in the man page of mount.ceph see https://github.com/ceph/ceph/blob/master/doc/man/8/mount.ceph.rst and http://docs.ceph.com/docs/jewel/man/8/mount.ceph/, but why is the mount.ceph command saying they are unknown?
This feature is documented in hammer, infernalis and jewel version docs/man pages.

Is this a problem of my ceph/system configuration or is this feature that has not been implemented?