Insert letter before citation with biblatex/biber only in one `refsection`

Question

I want to insert a letter (eg. "S") before citations both in text and in the bibliography. I've found a similar question here:
How to add a letter before the number of citation in the text?
However:

I want to do it for only a refsection,
with the using of biblatex/biber.

But I have no idea how. My MWE:
documentclass{article}

usepackage[sorting=none,backref=false]{biblatex}
bibliography{jobname.bib}

begin{document}

section{Considered as refsection 0}
This is a normal citation: cite{NiInt_3}.

section{Refsection1}
begin{refsection}
I want to cite this cite{NiInt_1} as [S1] here and in the bibliography.

printbibliography[keyword=withletter, title={With letter}]
end{refsection}

printbibliography[title={Without letter}]

end{document}

DG' · Accepted Answer

You can use newrefcontext[labelprefix=S] in a refcontext:
documentclass{article}

usepackage{filecontents}
begin{filecontents*}{jobname.bib}
  @book{lamport1994latex,
    title={LATEX: a document preparation system: user's guide and reference manual},
    author={Lamport, Leslie},
    year={1994},
    publisher={Addison-wesley}
  }
  @book{mittelbach2004latex,
    title={The LATEX companion},
    author={Mittelbach, Frank and Goossens, Michel and Braams, Johannes and Carlisle, David and Rowley, Chris},
    year={2004},
    publisher={Addison-Wesley Professional}
  }
end{filecontents*}
usepackage[sorting=none,backref=false]{biblatex}
bibliography{jobname.bib}

begin{document}

section{Considered as refsection 0}
This is a normal citation: cite{mittelbach2004latex}.

section{Refsection1}

begin{refsection}
newrefcontext[labelprefix=S]
I want to cite this cite{lamport1994latex} as [S1] here and in the bibliography.

printbibliography[title={With letter}]
end{refsection}

printbibliography[title={Without letter}]

end{document}

Insert letter before citation with biblatex/biber only in one `refsection`

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