Filtering cards by assignee in Scrum board Backlog

As a sprint planner I would like to filter the cards in the plan mode of a scrum board by a single assignee in order to fine tune the ranking for that particular user.

• A very nice way would be by clicking on one of the new profile icons of the involved users above each sprint, which are available since Jira Agile 6.6.
• The expected behaviour would be similar to the behaviour when clicking a version or an epic
• The filtered result should show each card that comply to the following condition: (issue is assigned to the selected user or has subtasks which are assigned to that selected user).