Bug#798314: systemd: Systemd waits 30 minutes to shut down because of NFS share

[Stephen Rogers]

Had this same problem on Debian Stretch. Tried many different things to
get the startup order proper but I could only seem to move the problem
from startup to shutdown and back. 

Finally this combination of options in my fstab seemed to get systemd
to both startup and shutdown in the right order.

192.168.1.10:/home/mythtv /home/mythtv	nfs	x-
systemd.requires=network.target,x-systemd.automount,x-systemd.device-
timeout=10,timeo=14,x-systemd.idle-timeout=1min 0 0

The systemd.required=network.target was the final piece of the puzzle
for me. The others options I am not sure if they are required but they
seemed like they'd help to avoid problems. Found the most about the
options here.

http://www.freedesktop.org/software/systemd/man/systemd.mount.html
 
I imagine this is more of a work around than a fix but hope this helps
someone.