The system cannot delete the selected shared folders because at least one is a highly available (clustered) shared folder ...

The system cannot delete the selected shared folders because at least one is a highly available (clustered) shared folder that contains shared subfolders, or is a subfolder in such shared folder.

To stop sharing a subfolder of a highly available shared folder, you can delete the subfolder. To stop sharing an entire highly available shared folder, use cluster management tools.