sudo mount -t cifs //server/share /mnt/share -o user=[act-dir user],domain=[domain],uid=[linux user],gid=[linux group]

sudo mount -t cifs //server/share /mnt/share -o user=[act-dir user],domain=[domain],cifsacl

umount /mnt
mount.cifs //FILESERVER/SHARE /mnt -v -o multiuser,domain=FILESERVER,username=CIFS_GUEST

mount | grep cifs

username=CIFS_GUEST
password=<pass>
Domain=FILESERVER

chown root /etc/cifs.SHARE.cred
chmod 600 /etc/cifs.SHARE.cred

umount /mnt
mount.cifs //FILESERVER/SHARE /mnt -v -o multiuser,credentials=/etc/cifs.SHARE.cred

...
//FILESERVER/SHARE /mnt cifs rw,auto,multiuser,credentials=/etc/cifs.SHARE.cred 0 0
...

cd /mnt
ls

cifscreds add FILESERVER -u <username>

...
auth optional pam_cifscreds.so debug
...
session optional pam_cifscreds.so domain=<AD Domain> debug
...