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Like Daris said, that type of plywood is typically used for exterior sheathing and roofs. It's not sanded so it's not usually as smooth as an AC or a CCPTS plywood. I suppose as long as the plies of plywood are laminated tightly together and don't have any loose spots at them it might be okay. That type of plywood isn't really designed for floors. All that said if it doesn't have loose pieces or lumps and bumps that can't be dealt with it might work. Though it probably isn't absolutely necessary it wouldn't hurt to fill them.... It's one of those judgment calls and it's hard without seeing the plywood to give you recommendations on it.