There may be some confusion here.
We don't advertise that our software (in this case adclient, DirectControl) works with Samba acting as the Directory Service.
We QA against MS Active Directory.
We are aware of instances of people making this work, but it's not a path that we actively support (or advertise).
The only component related to Samba that we advertise is our adbindproxy, which is another Identity Mapper (instead of Windbind) that resolves identities based on our technology.
This topic is not new, if you search this forum, there are instances in which people have tried to do this, but ultimately hit some limitation.
R.P