docs: def statfs(self, path):
          "Return a statvfs(3) structure, for stat and df and friends"
          # from fuse.py source code:
          #
          # class c_statvfs(Structure):
          # _fields_ = [
          # ('f_bsize', c_ulong), # preferred size of file blocks, in bytes
          # ('f_frsize', c_ulong), # fundamental size of file blcoks, in bytes
          # ('f_blocks', c_fsblkcnt_t), # total number of blocks in the filesystem
          # ('f_bfree', c_fsblkcnt_t), # number of free blocks
          # ('f_bavail', c_fsblkcnt_t), # free blocks avail to non-superuser
          # ('f_files', c_fsfilcnt_t), # total file nodes in file system
          # ('f_ffree', c_fsfilcnt_t), # free file nodes in fs
          # ('f_favail', c_fsfilcnt_t)] #
          #
          # On Mac OS X f_bsize and f_frsize must be a power of 2
          # (minimum 512).
  
          _blocksize = 512
          _usage = self.client.usage
          _fs_size = self.client.capacity
          if _fs_size == -1: # unlimited
              # Since backend is supposed to be unlimited,
              # always return a half-full filesystem, but at least 1 TB)
              _fs_size = max(2 * _usage, 1024 ** 4)
          _bfree = ( _fs_size - _usage ) // _blocksize
          return {
              'f_bsize': _blocksize,
              'f_frsize': _blocksize,
              'f_blocks': _fs_size // _blocksize,
              'f_bfree': _bfree,
              'f_bavail': _bfree,
              # 'f_files': c_fsfilcnt_t,
              # 'f_ffree': c_fsfilcnt_t,
              # 'f_favail': c_fsfilcnt_t
  
          }