How-To smbfs: smbmnt must be installed suid root

Quite often, when using program such as smb4k, I encountered the following error:
smbmnt must be installed suid root for direct user mounts
This happens because some linux distribution does not configure smbfs properly such as a normal user can mount samba files.
This how-to will show how to simply resolve this issue.
smb4k, a QT base [...]