http://wiki.contribs.org/Advanced_Samba
If somebody has a suggestion or a link for more info I would appreciate it. 
Greg did a huge amount of work on trying to implement a full Samba 4 implementation. Regrettably someone decided to attack a few people personally about some issues (over which they were misinformed and mouthed off with no foundation whatsoever) and it was about all Greg (and several of us) could take.
We all do this voluntarily in our own time, with no small sacrifice to home and families quite frequently, and nature of the abuse directed at us was completely unfounded, unnecessary, and disheartening. As a result of this Greg decided to discontinue his work, which was tragic for SME.
His work is in SME 9 CVS at smeserver-samba
It requires the sernet-samba packages compiled for SME (I did the first ones for Greg and could do them again I guess)
I would love to see it finished off but, as he has advised me, it is probably a months worth of solid work to get the thing about right. And there is no one else around with either the time or the skills to do that right now
Unless you know someone ......
So the lesson is if you want something done, do it yourself, or be frightfully nice to the people working on the distro and try not to p*ss them off too much. Help and constructive criticism are always welcome. Negativity and personal slating is not.
Sorry I can't be more positive. The whole episode upset me a lot and makes my blood boil just thinking about it..... we lost a long time loyal supporter of SME and the opportunity to steal a march on the competition.
B. Rgds
John