temporary thread hijack:
a filter does NOTHING for fall protection. a filter is a rigid body, and as such, it does NOT dampen the force from a fall (impulse actually, but let's not get technical). all of the force is still transferred to the lens and camera. what a filter does do in that situation is risk seriously scratching the front element if it shatters.
a hood, in contrast, is flexible, and acts like a crumple zone, slowing down the impact. the only problem is if it falls obliquely and acts like a lever arm, ripping the filter threads off. usually not the case, but it's not unheard of.
in other words, don't drop your lenses. but if you think you might, use a hood.