code: def detect_mountpoint(self):
          
  
          if self.info.get('lastmountpoint'):
              return self.info.get('lastmountpoint')
          if not self.mountpoint:
              return None
  
          result = None
          paths = os.listdir(self.mountpoint)
          if 'grub' in paths:
              result = '/boot'
          elif 'usr' in paths and 'var' in paths and 'root' in paths:
              result = '/'
          elif 'bin' in paths and 'lib' in paths and 'local' in paths and 'src' in paths and 'usr' not in paths:
              result = '/usr'
          elif 'bin' in paths and 'lib' in paths and 'local' not in paths and 'src' in paths and 'usr' not in paths:
              result = '/usr/local'
          elif 'lib' in paths and 'local' in paths and 'tmp' in paths and 'var' not in paths:
              result = '/var'
          # elif sum(['bin' in paths, 'boot' in paths, 'cdrom' in paths, 'dev' in paths, 'etc' in paths, 'home' in paths,
          #          'lib' in paths, 'lib64' in paths, 'media' in paths, 'mnt' in paths, 'opt' in paths,
          #          'proc' in paths, 'root' in paths, 'sbin' in paths, 'srv' in paths, 'sys' in paths, 'tmp' in paths,
          #          'usr' in paths, 'var' in paths]) > 11:
          #    result = '/'
  
          if result:
              self.info['lastmountpoint'] = result
              if not self.info.get('label'):
                  self.info['label'] = self.info['lastmountpoint']
              logger.info("Detected mountpoint as {0} based on files in volume".format(self.info['lastmountpoint']))
  
          return result
docs: Attempts to detect the previous mountpoint if this was not done through :func:`load_fsstat_data`. This
          detection does some heuristic method on the mounted volume.