Samba does support WINS to a certain extend and for NS7 it would mean that WINS, if set as active, it would be on the NSDC container.
However, you realize it is an (almost) deprecated protocol that for most OS-es and applications has been replaced by DNS. Before you try to get WINS to use, ask yourself if you absolutely need it. WINS is quite vulnerable and might introduce some unwanted traffic from legit identification UDP broadcasts to broadcast storms that potentially make your network unusable.
It’s been like 15+ years I had to actively support WINS on an NT4 network. If you want to read some detailed info about WINS, please start at the red hat support site: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Deployment_Guide/s2-samba-wins.html