You have to disable the header and footer by setting the values to 0pt.
\setuplayout
[backspace=15mm,
width=middle,
topspace=15mm,
height=middle,
header=0pt,
footer=0pt]
\showframe
\starttext
\input knuth
\stoptext
You can also use the fullpage module when you equal margins for your document.
\usemodule[fullpage][style={margin,empty},margin=15mm]
\showframe
\starttext
\input knuth
\stoptext
Wolfgang ___________________________________________________________________________________
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