Isilon to Unity NAS Migration

Hey folks got a question here and I think I know the answer (can't be done) but I want to ask the question any way.

I got an isilon with OneFS 7.X that hosts a NAS with SMB shares that uses local directory on the isilon for user mapping and access (no LDAP, NIS or AD in the environment). I want to migrate this to a Unity NAS with SMB sharing and bring over the ACL's and use the Unity NAS like I was doing the Isilon. I don't think this is possible I think to do what I need, I would need an LDAP server (at a minimum) to handle the mapping. 

Can someone point me in the right direction here?

Thanks,

Clay!