If by "host" you mean the client rather than the server, and if I understand correctly, the problem I anticipate would be that the API doesn't allow you to use that cached metadata, even if the client has already received it, because there's no guarantee that when you query a file inside some folder, it'll be the same as it was when you enumerated that folder, so I'd assume you can't eliminate the round trip without changing the API. Not sure if I've understood the scenario correctly but that seems to be the issue to me.