While sharing any files or folder you get an option of "Link Setting" which says who would you like this link to work for. Like below: 1. Anyone with the link. 2. People in your Org. 3. People with existing access. 4. Specific People. If you choose "Specific People" and and share with a person by entering his/her email address, that people will receive the link and can access however he won't be able to further share the file or folder link.