docs: def insert(self, path, simfile):
          """
          Insert a file into the filesystem. Returns whether the operation was successful.
          """
          if self.state is not None:
              simfile.set_state(self.state)
          mountpoint, chunks = self.get_mountpoint(path)
  
          if mountpoint is None:
              self._files[self._join_chunks(chunks)] = simfile
              return True
          else:
              return mountpoint.insert(chunks, simfile)