[CentOS] CentOS 7 samba server + mac client problems

This is my smb.conf, it's extremely basic.

https://paste.fedoraproject.org/519466/34678791/

Note that max version is commented out. I've been using some version
of Samba 4 for a little over a year, and with macOS versions 10.9
through 10.12.

Chris Murphy