You can set distinct folder permissions for every group you've created in your workspace. You must be a Workspace Admin in order for this to work.
To begin, click 'Manage Workspace'.
Next, click 'Access and Permissions'.
Then, click 'Folder Permissions'.
This first set of buttons represents the default permissions for all users and groups in your workspace. To edit groups permissions, click the drop-down menu on the left.
Next, select a group from the list.
Notice, an additional button-set is now present over the default button set. This new button set represents the permissions for the group you've just selected. You can click on a button to change the corresponding permissions. Green buttons represent permissions this group can perform within your workspace. Red buttons represent permissions this group cannot perform. Note: You can set specific permissions for every folder within your workspace.
Click 'Save (n) Change(s)'.
Hover your cursor over a button to see what permissions this user can or cannot perform.