Fedora ships Samba4
Samba4 provides improved cross-platform file server support for Fedora 18. The release supports the new SMB2.2 and SMB3 protocols and includes an LSA Service Daemon for FreeIPA trust relationship support. Administrators leaning on python will be pleased with Samba's new scripting interface, which allows Python programs access to Samba's internals.
The Samba project is also working towards the ability to act as an Active Directory domain controller, but this functionality may not be available at the time of the Fedora 18 release.