A standalone Samba server is an implementation that is not a member of a Windows NT4 domain, a Windows 200X Active Directory domain, or a Samba domain.

By definition, this means that users and groups will be created and controlled locally, and the identity of a network user must match a local UNIX/Linux user login. The IDMAP facility is therefore of little to no interest, winbind will not be necessary, and the IDMAP facility will not be relevant or of interest.