/usr/include/ncbi-vdb/kfs/ is in libncbi-vdb-dev 2.8.1+dfsg-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ncbi-vdb/kfs/arc.h
/usr/include/ncbi-vdb/kfs/arrayfile.h
/usr/include/ncbi-vdb/kfs/buffile.h
/usr/include/ncbi-vdb/kfs/bzip.h
/usr/include/ncbi-vdb/kfs/cacheteefile.h
/usr/include/ncbi-vdb/kfs/countfile.h
/usr/include/ncbi-vdb/kfs/crc.h
/usr/include/ncbi-vdb/kfs/defs.h
/usr/include/ncbi-vdb/kfs/directory.h
/usr/include/ncbi-vdb/kfs/directory.hpp
/usr/include/ncbi-vdb/kfs/dyload.h
/usr/include/ncbi-vdb/kfs/extendable-ramfile.h
/usr/include/ncbi-vdb/kfs/extern.h
/usr/include/ncbi-vdb/kfs/ffext.h
/usr/include/ncbi-vdb/kfs/ffmagic.h
/usr/include/ncbi-vdb/kfs/file-impl.h
/usr/include/ncbi-vdb/kfs/file-v1.h
/usr/include/ncbi-vdb/kfs/file-v2.h
/usr/include/ncbi-vdb/kfs/file.h
/usr/include/ncbi-vdb/kfs/file.hpp
/usr/include/ncbi-vdb/kfs/fileformat.h
/usr/include/ncbi-vdb/kfs/filetools.h
/usr/include/ncbi-vdb/kfs/gzip.h
/usr/include/ncbi-vdb/kfs/impl.h
/usr/include/ncbi-vdb/kfs/kfs-priv.h
/usr/include/ncbi-vdb/kfs/lockfile.h
/usr/include/ncbi-vdb/kfs/manager.h
/usr/include/ncbi-vdb/kfs/md5.h
/usr/include/ncbi-vdb/kfs/mmap.h
/usr/include/ncbi-vdb/kfs/nullfile.h
/usr/include/ncbi-vdb/kfs/pagefile.h
/usr/include/ncbi-vdb/kfs/path-priv.h
/usr/include/ncbi-vdb/kfs/path.h
/usr/include/ncbi-vdb/kfs/pmem.h
/usr/include/ncbi-vdb/kfs/quickmount.h
/usr/include/ncbi-vdb/kfs/ramfile.h
/usr/include/ncbi-vdb/kfs/readheadfile.h
/usr/include/ncbi-vdb/kfs/sra.h
/usr/include/ncbi-vdb/kfs/subfile.h
/usr/include/ncbi-vdb/kfs/szip.h
/usr/include/ncbi-vdb/kfs/tar.h
/usr/include/ncbi-vdb/kfs/teefile.h
/usr/include/ncbi-vdb/kfs/toc.h
/usr/include/ncbi-vdb/kfs/wgaencrypt.h