First, the Linux kernel doesn’t support resource forks at all. They aren’t part of POSIX nor do they really fit the unix file philosophy.

The resource fork isn't gonna be really meaningful to essentially all Linux software, but there have been ways to access filesystems that do have resource forks. IIRC, there was some client to mount some Apple file server protocol, exposed the resource forks as a file with a different name and the data fork as just a regular file.

https://www.kernel.org/doc/html/latest/filesystems/hfsplus.html

Linux does support HFS+, which has resource forks, as the hfsplus driver, so I imagine that it provides access one way or another.

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https://superuser.com/questions/363602/how-to-access-resource-fork-of-hfs-filesystem-on-linux

Add /..namedfork/rsrc to the end of the file name to access the resource fork.

Also, pretty esoteric, but NTFS, the current Windows file system, also has a resource fork, though it's not typically used.

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Ah, the WP article that OP, @evol@lemmy.today linked to describes it.

The Windows NT NTFS can support forks (and so can be a file server for Mac files), the native feature providing that support is called an alternate data stream. Windows operating system features (such as the standard Summary tab in the Properties page for non-Office files) and Windows applications use them and Microsoft was developing a next-generation file system that has this sort of feature as basis.