I'd like to create a filter based on a filed like for example "Users" but i just want that a specific group of users like the Managers group see that filter on the Dashboard.
So if a regular user log in he will not able to see the user's filters, but if a Manager log in he will be able to see it.
Is it possible to insert a filter on Dashboard and control its view?
Sort of. Look at this link:
It will look like what you want to the end user, but the way you do it is not precisely what you've asked. It does work, though!