I'm working in odoo 10, I have to control access to items in kanban view. For example, in customer kanban view, for one user, I want to show all customers, but the user can open only those affected to him.

customers affected to my user (demo) = 5

all customers = 20

in kanban view, we want to display 20 customers, but demo opens only 5 customers, and he doesn't have access to 15.