On bitbucket, forbidden tag when they are not on master

Question

on bitbucket, is it possible to reject tags push which are not on master branch with a prehook.

I started with the following snippet

refChanges.any { it.ref.id.startsWith("refs/tags/") &&
    it.type == RefChangeType.ADD
}

but not sure which method I can check to know if the commit where the tag is done is on master

BR