For efficiency, `fs.CopyFile` should use `clonefile(2)` on macOS when `VOL_CAP_INT_CLONE` is available. man: https://github.com/apple/darwin-xnu/blob/xnu-7195.101.1/bsd/man/man2/clonefile.2
For efficiency,
fs.CopyFileshould useclonefile(2)on macOS whenVOL_CAP_INT_CLONEis available.man: https://github.com/apple/darwin-xnu/blob/xnu-7195.101.1/bsd/man/man2/clonefile.2