Such restrictions have to be configured on server-side.
I would like to present you the following use case to see if it possible to do with WINSCP.
I have a sftp wit only one user. I need to know if is possible to set password to folders through WINSCP becuase many people use the sftp (using this user) but we dont want them have access to all folders submitted on the SFTP.
Do you know if there is a workaround to accomplish my use case?