GPLv2 is a wrong license for this project

[isbm]

According to the explanation at gnu.org, GPL version can only increase, but never go lower. Also, if you are binding to the GPL project, your work is derivative, therefore should have be GPL as well.

Therefore, under these circumstances, it is not allowed to license your derivative under GPLv2, if you are binding to libparted, which is licensed under GPLv3.