/usr/include/dolfin/io/ is in libdolfin1.0-dev 1.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dolfin/io/BinaryFile.h
/usr/include/dolfin/io/Encoder.h
/usr/include/dolfin/io/File.h
/usr/include/dolfin/io/GenericFile.h
/usr/include/dolfin/io/RAWFile.h
/usr/include/dolfin/io/SAX2AttributeParser.h
/usr/include/dolfin/io/VTKFile.h
/usr/include/dolfin/io/VTKWriter.h
/usr/include/dolfin/io/XMLArray.h
/usr/include/dolfin/io/XMLFile.h
/usr/include/dolfin/io/XMLFunctionData.h
/usr/include/dolfin/io/XMLFunctionPlotData.h
/usr/include/dolfin/io/XMLLocalMeshSAX.h
/usr/include/dolfin/io/XMLMesh.h
/usr/include/dolfin/io/XMLMeshFunction.h
/usr/include/dolfin/io/XMLMeshValueCollection.h
/usr/include/dolfin/io/XMLParameters.h
/usr/include/dolfin/io/XMLVector.h
/usr/include/dolfin/io/XYZFile.h
/usr/include/dolfin/io/base64.h
/usr/include/dolfin/io/dolfin_io.h
/usr/include/dolfin/io/xmlutils.h