Zfs Allow and Setuid / Devices Property

Hi,
Hope someone could help me here.

I have delegated permissions to a zfs dataset in a NGZ as below:

root@zone# zfs allow poolname/dataset                                                                               
---- Permissions on poolname/dataset -------------------------------
Local+Descendent permissions:
        user zfsuser create,destroy,devices,mount,mountpoint,receive,rename,send,setuid,snapshot

There are a number of descendent datasets under poolname/dataset

When root runs zfs mount -a all datasets in the zone mount with setuid=on

When the delegated user runs the same they are all mounted with setuid=off, zfs get setuid looks like

poolname/dataset/data              setuid    off     temporary

Even if this user runs, zfs mount poolname/dataset -o setuid=on it still mounts as setuid=off.