When sharing with users, groups, circles or members of a Talk conversation, rights for the files or folder contents are adjustable:
As a sharee, you can configure if you automatically want to accept all incoming shares and have them added to your root folder, or if you
want to be asked each time if you want to accept or decline the share.
For adjusting the acceptance setting, go to Settings > Personal > Sharing:
In order to find out if a file or folder is accessible to others through sharing of a superior folder
hierarchy level, click on Others with access in the sharing tab:
The list shows all users, groups, chats etc. that the current object has been given access to through
sharing of a superior folder in the hierarchy:
Click on the three dots to:
see who initiated the share
see where the share was initiated (click to navigate to the folder, as far as you have access there)
unshare the initial share (only accessible for the share owner)
Note
This information is only visible to the owner of a file/folder or sharees with resharing rights.