[Samba] Adding Share Windows ACL

[Micha Ballmann]

Hello,

im trying to setup a share using windows acls. I followed the step ins 
https://wiki.samba.org/index.php/Setting_up_a_Share_Using_Windows_ACLs 
but hanging at "Adding a Share"

# mkdir -p /srv/samba/Demo/
# chown root:"Domain Admins" /srv/samba/Demo/
*--> chown: ungültige Gruppe: »root:Domain Admins“*

# net rpc rights list privileges SeDiskOperatorPrivilege -U "SAMDOM\administrator"
SeDiskOperatorPrivilege:
   ROOTRUDI\Domain Admins
   BUILTIN\Administrators

Do i need enable the UNIX Attribute for this group? I cant find any advice.

Best regards
Micha