'Retrieve the file serial number, also called inode number, which
distinguishes this file from all other files on the same device.
@raise NotImplementedError: if the platform is Windows, since the
inode number would be a dummy value for all files in Windows
@return: a number representing the file serial number
@rtype: L{int}
@since: 11.0'

def getInodeNumber(self):

    if platform.isWindows():
        raise NotImplementedError
    st = self._statinfo
    if (not st):
        self.restat()
        st = self._statinfo
    return st.st_ino
