diskspace - Get amount of free disk space using Go

Question

Basically I want the output of df -h, which includes both the free space and the total size of the volume. The solution needs to work on Windows, Linux, and Mac and be written in Go.

I have looked through the os and syscall Go documentation and haven't found anything. On Windows, even command line utils are either awkward (dir C:) or need elevated privileges (fsutil volume diskfree C:). Surely there is a way to do this that I haven't found yet...

UPDATE:
Per nemo's answer and invitation, I have provided a cross-platform Go package that does this.

Answer 1

Waitting for answers