Folder Permission on mounted NAS storage

I created an SFTP Server with Jailed Folders. I want to move these Folders on a mounted NAS Storage. My issue is the right Folder permissions that come from the mount. The Linux Box is connected with Active Directory, so users and groups get delivered from there.

Folder Structure how it should be:

Appdata                      <- root:root 755
Appdata/SFTPdata             <- root:root 700
Appdata/SFTPData/%h          <- root:root 755
Appdata/SFTPData/%h/upload   <- user:usr-sftp 700

When i now mount the NAS Storage with

mount -t cifs -o user=admin,gid=13371337,rw,forcegid,domain=DOMAIN.lan,iocharset=utf8,file_mode=0770,dir_mode=0770  //storage.DOMAIN.lan/SFTPTestUnix /Appdata/

as root, all Folders in the mounted drive are now set as root:usr-sftp (the gid is the AD group usr-sftp) with chmod 770 (coming from file and dir_mode).

Question: How can I workaround this issue. Is there a better way to do this? Im currently using cifs, is nfs more suitable for this?