You can publish the information to the group members by creating the group in website and in setting the publication range of folders or the files in resource tool to the group.

• Hypothetically you created "Instructor and TA" in clicking "Setting website"→"Control(or manage) the group"→"Create new groups".
• Then you add "Role:Instructor" and "Role:Teaching Assistant" to "Instructor and TA" and press "update".
• Choose "create the folder" in "Resource" and create "TA Only" subfolder.
• Choose "Edit the details" from the "operation" in "TAOnly" and check "Only the choosen group members can browse this folder and the content" in "available/unavailable and access". Then choose "Instructor and TA" and update.

With the operation mentioned above. You can use "TA Only" which will be published only to the staff on charge and TA.You can set the group access authority in a file. However,it will be the same setting as that of parent folder ID with the setting for browsing the folder which the file belongs.

※:Access restriction is set from the users' list where the role is given. Even if you choose "Students" role" in the "display the website with the next role" shown in the upper right, the role is kept shown to the staff in charge.