/usr/include/dolfin/function/ is in libdolfin-dev 2017.2.0.post0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dolfin/function/CoefficientAssigner.h
/usr/include/dolfin/function/Constant.h
/usr/include/dolfin/function/Expression.h
/usr/include/dolfin/function/Function.h
/usr/include/dolfin/function/FunctionAXPY.h
/usr/include/dolfin/function/FunctionAssigner.h
/usr/include/dolfin/function/FunctionSpace.h
/usr/include/dolfin/function/GenericFunction.h
/usr/include/dolfin/function/LagrangeInterpolator.h
/usr/include/dolfin/function/MultiMeshCoefficientAssigner.h
/usr/include/dolfin/function/MultiMeshFunction.h
/usr/include/dolfin/function/MultiMeshFunctionSpace.h
/usr/include/dolfin/function/MultiMeshSubSpace.h
/usr/include/dolfin/function/SpecialFacetFunction.h
/usr/include/dolfin/function/SpecialFunctions.h
/usr/include/dolfin/function/assign.h
/usr/include/dolfin/function/dolfin_function.h