Tree roots are a lot like sand whoops and rock gardens - the faster you go the easier they become to conquer but the consequences are much bigger if you get it wrong, especially if you let the front wheel drop down and slam into a big one. With tree roots, it's best to be standing up for a smoother ride and to help better maintain your balance. If possible, you want to try and approach them straight on.
Generally, run a gear higher for more tractable power so that you can carry your momentum and lighten the front wheel so it skims and floats over the top. Banking off the sides of the trail can allow you to miss many exposed roots in the main hacked out portion of the trail. If you need to sit down, especially when exiting a corner or climbing a steep hill, use the seat bounce technique of preloading the rear end so as to help the front loft over the roots and the rear tyre glide over.
If you do stop or get stuck in the roots, use the slingshot technique to get moving again and get back up to speed. The big thing with roots is to try maintain your momentum and keep moving forward no matter how it is achieved - once you stop it is so much harder to get going again.
Keep on Roosting!