"testparn -vs|grep proto" gives: server max protocol = SMB3 server min protocol = LANMAN1 client max protocol = client min protocol = - "client * protocol" should give out the same as "server * max protocol" - the default of "min protocol" is not the default that is documented in the smb.conf man page - that says NT1.
As far as I know the default _is_ NT1, because our client tools don't take of these settings at all and use simply use NT1 :-)
This is fixed with the patchset for adding SMB2/3 support to smbclient in bug #9974. Jeremy. *** This bug has been marked as a duplicate of bug 9974 ***