Thanks! Actually, I decided to make this library during a OS course in which I made a microkernel (non usable but you can found it here). So currently the project is only to make this library, and I hope other projects will begin to use it if it becomes enough stable ^^
Have you looked at Redox OS? It's a microkernel-based OS written in Rust, and I'm guessing they could use something like this. I don't know what support they already have, but surely they don't have every basic filesystem implemented.
That said, the GPL v3 may be problematic, depending on the project. Still cool regardless though.