No way to get location of opened file?

If I open a file as

`f = Nio.open_file('xxx.nc', 'r')`

there seems to be no way to recover the file location 'xxx.nc' from the object `f` (unless it happens to be an attribute of xxx.nc). Is this intended? It would be very convenient for scopes into which `f` is passed to be able to recover this information.