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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: ZFS, unionfs - Operation not supported
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Oliver Pinter wrote:
> Hi all!
> 
> It is the problematic FS:
> zpower on /mnt/zpower (zfs, local)
> /usr/src on /mnt/zpower/jail/default/ports (nullfs, local)
> 
> and the failed command:
> mount_unionfs -o below /mnt/zpower/jail/default/ports/
> /mnt/zpower/jail/www/usr/ports/
> 
> (truss mount_unionfs -o below /mnt/zpower/jail/default/ports/
> /mnt/zpower/jail/www/usr/ports/ ) > & /tmp/unionfs.log
> 
> Have I any chance, to unionmount ZFS with UFS or ZFS not supported
> this operations?

Yes, unionfs is not supported with ZFS.