[Samba] What is --rfc2307-from-nss ??

[Greg Zartman]

I'm having a hard time figuring out what the samba-tool user create
--rfc2307-from-nss does?  The documentation is a little skinny.

I want users I create in the AD to be able to access local file shares on
Centos, so I'm setting up the SSSD service, but not entirely sure if SSSD
will provide user attributes like the login shell or if I should set it
explicitly in the active directory.

Thanks
-- 
Greg