code: def supplement_filesystem(old_size, user_cap=False):
      
      new_size = old_size
      if user_cap:
          if old_size <= _GiB_to_Byte(1.5):
              new_size = _GiB_to_Byte(3)
          else:
              new_size += _GiB_to_Byte(1.5)
      return int(new_size)
docs: Return new size accounting for the metadata.