Good manual regarding LXC idmapping

[godfatheroo7]

Hi,

i'm having difficulty to understand how to use IDMAPPING on multiple LXC's so that they work together.
Every LXC has it's own zvol, but 1 LXC (nas with cockpit) shares all those zvol's through CIFS..

There is 1 LXC doing SAB, should get 2001
There is 1 LXC doing Qbit, should get 2002
There is 1 LXC doing Jellyfin, should get 2003
The NAS should get 2010 but sould interpret the above?

Is there a manual that can help me understand the 0-1000 user-id mapping on top of 1000000?

Ohw.. did i mention it would be nice to use groups to make those ID's a member of?

It dazzles me...

Thx in advance