Ignore device; filters.conf documentation

Am I dumb, or is there not way to ignore a device?

For example, I have a USB device with 2 partitions `sdg1` and `sdh`.  I only want udiskie to mount the former.

Can this be accomplished with the existing `filters.conf` config syntax?

I had a quick look through the source and it seems like `is_handleable` could be used to inhibit mounting... but I'm not sure.

Incidentally, some more examples and explanation of the config syntax would be welcome.