Is there something like an "overlay" FUSE fs which pretend to write what you give it but then just discards what you give it and returns the actual file when yo

Is there something like an "overlay" FUSE fs which pretend to write what you give it but then just discards what you give it and returns the actual file when you attempt to read? To defeat checks right after writes it could return what you wrote once( or a configurable number of times) but after that just give you the original file when you read it.