Activities between Account and Contact in CRM 2015

Hello,

 In default settings in CRM 2015 on-premise, if I add some activity (or set regarding from outlook) to Contact,

 activity (email) is automatically tracked also to Account.

Is there any posibillity to set entity Contact or Activities to do not "sharing" activities from Contact to Account ?

To have acitivities only at contact if I set regarding or add activity to Contact.

Thanks all for answers