You could password protect each and every folder (Photos, videos, Notes, Bookmarks) on your iOS devices by encrypting them with passwords. These passwords could be "Fake Password" and a "Master Password".
Fake Password: Fake password is one which you share with the other users (your kids/partner for instance) of your device and have them access the files locked with Fake Password.
Master Password: Master password is one which protects your privacy from the other users of your device (your kids/partner for instance) and keeps your data secure.
Files/Folders locked with a Fake Password can be unlocked with the Master Password, but the files/folders locked with the Master Password cannot be unlocked with the Fake Password.