How to show seconds of last modified date when using sftp command?

When I use WinSCP to access my SFTP server, it shows me the last modified (changed) date including seconds. If I use sftp on Linux and run ls -l, it only shows the hours and minutes, but no seconds. How can I also show the seconds using sftp, like WinSCP does it? I already checked the sftp man page and the ls options there, but could not find a matching option.