/usr/ is in libsparsehash-dev 1.10-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/doc-base/
/usr/share/doc-base/sparsehash
/usr/share/doc/
/usr/share/doc/libsparsehash-dev/
/usr/share/doc/libsparsehash-dev/TODO
/usr/share/doc/libsparsehash-dev/copyright
/usr/share/doc/libsparsehash-dev/README.gz
/usr/share/doc/libsparsehash-dev/NEWS.gz
/usr/share/doc/libsparsehash-dev/AUTHORS
/usr/share/doc/libsparsehash-dev/README_windows.txt
/usr/share/doc/libsparsehash-dev/html/
/usr/share/doc/libsparsehash-dev/html/dense_hash_set.html
/usr/share/doc/libsparsehash-dev/html/implementation.html
/usr/share/doc/libsparsehash-dev/html/performance.html
/usr/share/doc/libsparsehash-dev/html/sparsetable.html
/usr/share/doc/libsparsehash-dev/html/designstyle.css
/usr/share/doc/libsparsehash-dev/html/index.html
/usr/share/doc/libsparsehash-dev/html/sparse_hash_map.html
/usr/share/doc/libsparsehash-dev/html/sparse_hash_set.html
/usr/share/doc/libsparsehash-dev/html/dense_hash_map.html
/usr/share/doc/libsparsehash-dev/changelog.Debian.gz
/usr/include/
/usr/include/google/
/usr/include/google/sparse_hash_map
/usr/include/google/sparsehash/
/usr/include/google/sparsehash/libc_allocator_with_realloc.h
/usr/include/google/sparsehash/sparsehashtable.h
/usr/include/google/sparsehash/sparseconfig.h
/usr/include/google/sparsehash/densehashtable.h
/usr/include/google/sparsehash/hashtable-common.h
/usr/include/google/sparse_hash_set
/usr/include/google/type_traits.h
/usr/include/google/sparsetable
/usr/include/google/dense_hash_map
/usr/include/google/dense_hash_set