I pulled up an area of carpet near our front l/r door to place laminate tile there. The carpet was so high, the door was too hard to open. The problem is, when I pulled out the carpet tacking nails from the subfloor (which is plywood), the nails did not come out cleanly. The plywood broke around the nails, and a few very small pieces broke out. Now, I'm not sure where to go from here. Is there a filler I can use to level the nail hole damage?