( and ) are parentheses
' is a quote
so your question is about quotes, not parentheses, correct?
when you list files with rclone ls, you get the exact filename.
when you list files on a mount, it is the operating system, that adds the quotes.
the quotes are added by the OS, same as any file with a space character.
notice that Untitled.md has no space character, so the OS does not enclose the filename with quotes.
does all that make sense?