Restrict who can see email in MS CRM 2015

MS CRM 2015 hosted with Office365

I want to restrict access to email by hierarchy.

Level 1 (top) has access to own email and all levels below.
Level 2 has access to own email and those at Level 3.
Level 3 only has access to own email.

It think that the Hierarchical security feature of 2015 should enable this kind of functionality.

Insights on how to make this work, please and thank you.
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Take a look at the following link, it solved a very similar issue for our company:
kflorianAuthor Commented:
Somewhat related but not the solution I need.
Rikin ShahMicrosoft Dynamics CRM ConsultantCommented:

I am jumping on an old question... But if this is not yet implemented...

Yes. It is possible to implement this scenario based on Hierarchical Security on 2015.

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