samba - Jul 2015 - Any one have previous versions working in samba 4.2 with zfs?

On older versions of samba I was able to expose zfs snapshots to windows 
clients as "previous versions" using:

vfs objects = shadow_copy2
shadow: snapdir = .zfs/snapshot
shadow: sort = desc
shadow: format = %Y-%m-%d
follow symlinks = yes
wide links = yes

Since upgrading to 4.2 the windows clients report no previous versions. 
Even though the snapshots are there in zfs.

Anyone have this working?

Thanks
RP