Samba and iptables UDP broadcast issues

Have been having issues with browsing Samba from Windows boxes or vice-versa for years, like me? No wonder - just google for "ip_conntrack_netbios_ns site:samba.org". See? It's not documented or even mentioned that that kernel module must be loaded for NetBIOS broadcasts to get thru firewall, except for one recent post, even though the issue was raised and solved 5 years ago: https://bugzilla.redhat.com/show_bug.cgi?id=113918 .