Thank you @Jennifer_Dungan for all the feedbacks and detailed solutions.
You are correct, we do not want to show everyone all data. So dropdown
of segments wont work for this case. So for our case, we have created
virtual report suite from the global report suite of all data and
permissions are granted to certain group of users to virtual report
suite only. So as the dashboard report suites cannot be configured based
on user roles, it is defaulting to Global report suite or any one report
suite ...