Opensuse Leap script to unmount NFS mount before shutdown or reboot

I have a problem to shutdown/reboot my Laptop when I have my NFS mounted. It takes a very long time to shutdown/reboot. In my fstab is:

192.168.x.x:/RAID5 /NAS nfs4 defaults,_netdev,noauto,users,minorversion=1 0 0

The user can mount and unmount the NFS in Dolphin file manager. When I umount the NFS before shutting down the system it almost instantly shuts down. I linked also the halt script to init.0/6 with umount /NAS but didn't help. Does anybody has a solution for my problem?

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