private function myParentDirectory(?int &$aboveBaseLevel = null, ?array &$directoryParts = null): bool
    {
        if (count($this->myDirectoryParts) > 0) {
            $aboveBaseLevel = $this->myAboveBaseLevel;
            $directoryParts = array_slice($this->myDirectoryParts, 0, -1);

            return true;
        }

        if ($this->myIsAbsolute) {
            return false;
        }

        $aboveBaseLevel = $this->myAboveBaseLevel + 1;
        $directoryParts = $this->myDirectoryParts;

        return true;
    }