We have large roots from a huge Silver Maple tree that are partially above ground and interfere with mowing.
Can I shave them so the mower can pass over them?
I would not do that, shaving off the roots can really hurt or even kill the tree. I would just go around the root then come back with scissors and cut around the root. You could also use a weed wacker to get close but try not to hit the root. It will not do much to the root but it could break you string on the weed wacker. Then get were you need to go with the scissors.