How can you set the permission of file server?

How can you set the permission of file server?
You can use the Server app to set standard permissions-Read & Write, Read Only, Write Only, or None-to control access to a folder and its contents. You can set different permissions for one user (the owner), one group, and all other users who log in. You can also set standard permissions on individual files. Standard permissions are also called POSIX permissions.In the Server app sidebar, select the server and then click Storage.Select the folder whose access permissions you want to change, and then choose Edit Permissions from the Action pop-up menu.To grant access to a different user, double-click the current user name and enter a different user account name.
As you type, the Server app looks up matching user accounts and displays them in list. Clicking a listed user grants access permissions to that user.To grant access to a different group, double-click the current group name and type the name of the new group.
As you type, the Server app looks up matching group accounts and displays them in a list. Clicking a listed group grants access permissions to it.To change the permission level for the user, group, or others, click the current setting in the Permission column and choose a setting from the pop-up menu.
The permission level you set for Others applies to any user who logs in but isn't the specified user or a member of the specified group.