Rsync ACLs over NFSv4 to EXT4 - rsync_xal_set: lsetxattr - Operation not supported

[Andrew LaPierre]

I think this is an NFS or ext4 question, but wanted to post this here for a
sanity check. :) I've been searching for over a week for a solution and
have turned up nil.

I'm trying to rsync with options -AX over an NFSv4 mount TO an ext4 drive
FROM an ext4 drive and both have acl and user_xattr enabled. The command:

    rsync -aAX /data/ /mnt/back/data

results in:

    rsync: rsync_xal_set:
lsetxattr(""/mnt/back/data/Users/user/Documents/Desktop"","security.NTACL")
failed: Operation not supported (95)

along with all the other files.

Running the same command to a local folder works perfect so I'm assuming it
has something to do with NFS4 or EXT4 on the Server side.

My fstab mount:

    UUID=732683f0-e6ac-42d6-a492-e07643d7719c /media/back   ext4
 defaults,acl,user_xattr,barrier=1       0       0

My nfs exports file:

    /media/back
 10.111.106.3(fsid=0,rw,async,no_root_squash,no_subtree_check)

My mount command:

    mount -t nfs4 -o proto=tcp,port=2049 10.111.106.12:/ /mnt/back

Version info:

Server

    Ubuntu 14.04.2

Client

    Ubuntu 14.04.2
    rsync 3.1.0

Thanks for any suggestions!
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