Hope this is enough?
[root@infra30 ~]# account-provider-test
...
msDs-masteredBy: CN=NTDS Settings,CN=NSDC-HOSTNAME,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=ad,DC=mydomain,DC=lan
msDS-IsDomainFor: CN=NTDS Settings,CN=NSDC-HOSTNAME,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=ad,DC=mydomain,DC=lan
masteredBy: CN=NTDS Settings,CN=NSDC-HOSTNAME,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=ad,DC=mydomain,DC=lan
fSMORoleOwner: CN=NTDS Settings,CN=NSDC-HOSTNAME,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=ad,DC=mydomain,DC=lan
...
P.S. I joined the QNAP NAS to my AD Domain but the RADIUS Server on the NAS did not show me the NethServer Domain User, this is the reason why I like to test it with LDAP, by the way…