How to disable backref for certain citations?

According to http://mirrors.ctan.org/macros/latex/contrib/hyperref/doc/backref.pdf:

If a citation should not be back cited, then the recording can be
turned off by option disable and enabled again afterwards, e.g.:

bookmarksetup{disable}cite{...}bookmarksetup{enable}

But in the following document this does not work. I don’t know how to fix it. To be precise I would like this feature with backref not hyperref.

documentclass{article}
usepackage{backref}


begin{document}
blablabla bookmarksetup{disable}cite{something}bookmarksetup{enable}
newpage
blablabla
cite{something}
begin{thebibliography}{1}
bibitem{something}
something
end{thebibliography}

end{document}