Share grafana iframe in a web site with security

I know some people have got this to work but I don’t know the details. Just by googling “grafana iframe authentication”, I found:

This is incorrect. Grafana has multi-tenant support (you can create multiple organizations that do not have access to other organizations’ dashboards).

Also, in the current Grafana 5.0 beta, a new feature is dashboard permissions: http://docs.grafana.org/v5.0/administration/permissions/#dashboard-folder-permissions so you can grant access to a folder (also a new feature) or to an individual dashboard.