Candidate data segmentation by personal coverage area

Summary

Is there any way we can prevent recruiting users from two different companies, but in the same User Group, to see the candidates on their respective requisitions.

Content

Is there any way we can prevent users belonging to same user group but different personal coverage areas, from being able to see candidates who have applied to their requisitions? In the current set up the users are prevented to see the requisitions created by recruiters belonging to different personal coverage areas (but same user group). But they can see all the external candidates. We want to prevent the users from viewing the candidates of requisitions which they do not own, collaborate on or are in their coverage areas.