code: def GetMountpoints(data=None):
    
    expiry = 60  # 1 min
  
    insert_time = MOUNTPOINT_CACHE[0]
    if insert_time + expiry > time.time():
      return MOUNTPOINT_CACHE[1]
  
    devices = {}
  
    # Check all the mounted filesystems.
    if data is None:
      data = "\n".join(
          [open(x, "rb").read() for x in ["/proc/mounts", "/etc/mtab"]])
  
    for line in data.splitlines():
      try:
        device, mnt_point, fs_type, _ = line.split(" ", 3)
        mnt_point = os.path.normpath(mnt_point)
  
        # What if several devices are mounted on the same mount point?
        devices[mnt_point] = (device, fs_type)
      except ValueError:
        pass
  
    MOUNTPOINT_CACHE[0] = time.time()
    MOUNTPOINT_CACHE[1] = devices
  
    return devices
docs: List all the filesystems mounted on the system.