statvfs(
path) ->info,err
Get filesystem capacity information for a path
Wraps statvfs(3). Returns a table with bsize, blocks, bfree,
bavail, files and ffree. Block counts are in units of bsize,
which carries the fragment size (f_frsize) the counts are defined
in, so blocks * bsize is byte-correct. bavail is the space
available to unprivileged users; bfree includes the root reserve.