/usr/include/dolfin/io/ is in libdolfin1.3-dev 1.3.0+dfsg-2.
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/ExodusFile.h
/usr/include/dolfin/io/File.h
/usr/include/dolfin/io/GenericFile.h
/usr/include/dolfin/io/HDF5Attribute.h
/usr/include/dolfin/io/HDF5File.h
/usr/include/dolfin/io/HDF5Interface.h
/usr/include/dolfin/io/HDF5Utility.h
/usr/include/dolfin/io/RAWFile.h
/usr/include/dolfin/io/SAX2AttributeParser.h
/usr/include/dolfin/io/SVGFile.h
/usr/include/dolfin/io/VTKFile.h
/usr/include/dolfin/io/VTKWriter.h
/usr/include/dolfin/io/X3DFile.h
/usr/include/dolfin/io/XDMFFile.h
/usr/include/dolfin/io/XMLArray.h
/usr/include/dolfin/io/XMLFile.h
/usr/include/dolfin/io/XMLFunctionData.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