No way to get location of opened file?

[jhollowed]

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.