Modify the file /usr/share/upstart/sessions/mediascanner-2.0.conf so that the following lines are all commented with a "#" at the start
start on started dbus respawn ubuntu exec mediascanner-service-2.0
Prevent scanning in a directory
Add a file called ".nomedia" to the directory you wish to skip
The mediascanner database is located at ~/.cache/mediascanner-2.0/mediastore.db
Running on desktop
Mediascanner2 needs an env var set to run from Ubuntu 17.04.