What's the fastest way to copy, preserving file attributes, on each platform?

I am looking copy files platform-dependently on Linux, Oracle Solaris, MacOS, BSDs, and Windows.

I have found some system calls for each platform, namely sendfile(), copy_file_range(), fcopyfile(), CopyFile() et cetera. But some of them are documented to copy file attributes, whilst some are not. I am uncertain whether it would be better to do a stat() + chmod() prior the syscalls that do not copy attributes, or go with the classic route of open() + stat() + chmod() + read() + write(), that's guaranteed to work across all UNIX-like systems, and perhaps even Windows.

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What's the fastest way to copy, preserving file attributes, on each platform?

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