CentreStack in an Enterprise File Sync and Share platform. It allows creating team folders or attaching existing shares as team folders and publishing them so users who are given permissions to the team folders can access the data and collaborate on that data.
In CentreStack when a folder is published, users can be given read, write or owner permissions which is similar to a share permission. If you want to define explicit permissions on a folder you can configure those permissions using 'Edit folder permissions' option.
The video below demonstrates how to define explicit permissions on folders.