The Samba-Bugzilla – Bug 12823
Samba doesn't recognise RootDNSServers as a zone
Last modified: 2017-06-07 15:12:09 UTC
The DN: DC=RootDNSServers,CN=MicrosoftDNS,DC=DomainDnsZones,DC=samdom,DC=example,DC=com is a dns zone, it has the objectclass 'dnsZone'
Samba totally ignores this zone and you cannot update any of the zone records.