How to apply the different access permission to a directory between ssh an sftp access with the same user.

Issue

• I wanted to apply the different directory access between the ssh access and the sftp one with the same user.
• For example:
  • A user has /private and /public directories in the home directory.
  • On ssh session, I want to allow the user to access (read/write) to the both directories.
  • On sftp session, I want to allow the user to access to the /public directory, but not to the /private directory.