[Tracker] Disable indexing a subtree with tracker?

[Brandon Philips <brandon ifup co>]

Hello-

I am working on an SDK that creates Linux disk images. As part of the
build process it creates and mounts various loopback devices.

It seems tracker sometimes inspects these mount points and causes
unmounts to fail. Instead of telling every user of my SDK to disable
indexing of new attached volumes via Tracker preferences can I place a
file somewhere to disable indexing the entire subtree of my SDK?

For example:

echo "*" > $SDK_ROOT/.trackerignore

Thanks!

Brandon