code: def main():
      
      args = command.parse_args()
  
      with btrfs.FileSystem(args.dir) as mount:
          # mount.rescanSizes()
  
          fInfo = mount.FS_INFO()
          pprint.pprint(fInfo)
  
          vols = mount.subvolumes
  
          # for dev in mount.devices:
          #     pprint.pprint(dev)
  
          for vol in vols:
              print(vol)
  
      return 0
docs: Main program.