https://github.com/docker/docker/blob/950658bbb63480de254a166bdeaef1fc8b8fe644/opts/secret.go#L56-L59

I don't think this will work correctly on a Windows client talking to a Linux engine, or vice versa.

cc @dnephin @ehazlett