/usr/share/ is in mffm-fftw-dev 1.7-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/
/usr/share/doc/mffm-fftw-dev/
/usr/share/doc/mffm-fftw-dev/changelog.Debian.gz
/usr/share/doc/mffm-fftw-dev/html/
/usr/share/doc/mffm-fftw-dev/html/examples.html
/usr/share/doc/mffm-fftw-dev/html/tab_r.gif
/usr/share/doc/mffm-fftw-dev/html/realFFTExample_8cc-example.html
/usr/share/doc/mffm-fftw-dev/html/real2DFFTExample_8cc-example.html
/usr/share/doc/mffm-fftw-dev/html/classrealFFT-members.html
/usr/share/doc/mffm-fftw-dev/html/classrealFFTData.html
/usr/share/doc/mffm-fftw-dev/html/functions_vars.html
/usr/share/doc/mffm-fftw-dev/html/classes.html
/usr/share/doc/mffm-fftw-dev/html/classcomplexFFTData-members.html
/usr/share/doc/mffm-fftw-dev/html/classreal2DFFT-members.html
/usr/share/doc/mffm-fftw-dev/html/namespaces.html
/usr/share/doc/mffm-fftw-dev/html/complexFFTExample_8cc-example.html
/usr/share/doc/mffm-fftw-dev/html/realFFTData_8H_source.html
/usr/share/doc/mffm-fftw-dev/html/classrealFFTData-members.html
/usr/share/doc/mffm-fftw-dev/html/classcomplexFFT.html
/usr/share/doc/mffm-fftw-dev/html/tab_b.gif
/usr/share/doc/mffm-fftw-dev/html/files.html
/usr/share/doc/mffm-fftw-dev/html/classrealFFT.html
/usr/share/doc/mffm-fftw-dev/html/real2DFFT_8H-source.html
/usr/share/doc/mffm-fftw-dev/html/classreal2DFFTData.html
/usr/share/doc/mffm-fftw-dev/html/doxygen.css
/usr/share/doc/mffm-fftw-dev/html/namespacestd.html
/usr/share/doc/mffm-fftw-dev/html/classcomplexFFTData.html
/usr/share/doc/mffm-fftw-dev/html/real2DFFT_8H_source.html
/usr/share/doc/mffm-fftw-dev/html/tab_l.gif
/usr/share/doc/mffm-fftw-dev/html/functions.html
/usr/share/doc/mffm-fftw-dev/html/classcomplexFFT-members.html
/usr/share/doc/mffm-fftw-dev/html/index.html
/usr/share/doc/mffm-fftw-dev/html/realFFTData_8H-source.html
/usr/share/doc/mffm-fftw-dev/html/complexFFT_8H_source.html
/usr/share/doc/mffm-fftw-dev/html/classreal2DFFTData-members.html
/usr/share/doc/mffm-fftw-dev/html/annotated.html
/usr/share/doc/mffm-fftw-dev/html/functions_func.html
/usr/share/doc/mffm-fftw-dev/html/classreal2DFFT.html
/usr/share/doc/mffm-fftw-dev/html/realFFT_8H-source.html
/usr/share/doc/mffm-fftw-dev/html/realFFT_8H_source.html
/usr/share/doc/mffm-fftw-dev/html/tabs.css
/usr/share/doc/mffm-fftw-dev/html/complexFFT_8H-source.html
/usr/share/doc/mffm-fftw-dev/html/doxygen.png
/usr/share/doc/mffm-fftw-dev/changelog.gz
/usr/share/doc/mffm-fftw-dev/copyright
/usr/share/doc/mffm-fftw-dev/README.Debian
/usr/share/doc/mffm-fftw-dev/examples/
/usr/share/doc/mffm-fftw-dev/examples/real2DFFTExample.cc
/usr/share/doc/mffm-fftw-dev/examples/realFFTExample.cc
/usr/share/doc/mffm-fftw-dev/examples/sine.1000Hz.dat.gz
/usr/share/doc/mffm-fftw-dev/examples/complexFFTExample.cc
/usr/share/doc/mffm-fftw-dev/README