public function up(int $move = 1): self
    {
        $this->storage->cd(array_fill(0, $move, '/..'));
        return $this;
    }
public function up(int $move = 1): self
    {
        $this->storage->cd(array_fill(0, $move, '/..'));
        return $this;
    }
move directory upwards (like /../)
@param int $move
@return self