/ renaming

to avoid "Where= setting doesn't match unit name. Refusing."
https://unix.stackexchange.com/questions/283442/systemd-mount-fails-where-setting-doesnt-match-unit-name

dots/systemd/mnt-nas.mount

@@ -0,0 +1,13 @@
+[Unit]
+Description=Mount of NAS (/mnt/nas)
+
+[Mount]
+What=//192.168.1.222/fro
+Where=/mnt/nas
+Type=cifs
+Options=iocharset=utf8,rw,file_mode=0777,dir_mode=0777,user=USERNAME,password=PASSWORD
+TimeoutSec=30
+
+[Install]
+WantedBy=remote-fs.target
+WantedBy=multi-user.target