Folder level tracking is new feature in CRM 2015.
http://blog.sonomapartners.com/2015/05/crm-online-spring-2015-folder-level-tracking.html
https://www.youtube.com/watch?v=HiNpINvFKq8
http://blog.sonomapartners.com/2015/05/crm-online-spring-2015-folder-level-tracking.html
https://www.youtube.com/watch?v=HiNpINvFKq8