sh-3.2# cat /lib/systemd/system/system.mount
[Unit]
Description=Droid mount for /system
Before=local-fs.target systemd-modules-load.service

[Mount]
What=/dev/mmcblk0p37
Where=/system
Type=ext4
Options=ro,remount
# Options had SELinux context option:

# Default is 90 which makes mount period too long in case of
# errors so drop it down a notch.
TimeoutSec=10

[Install]
WantedBy=local-fs.target

# From ./out/target/product/moto_msm8960_jbbl/root/init.target.rc :
#     mount ext4 /dev/mmcblk0p37 /system ro remount