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Merge pull request #8607 from ThomasWaldmann/faq-slow-fat-1.4

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FAQ: Why is backing up an unmodified FAT filesystem slow on Linux?
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@ -478,6 +478,17 @@ will only be applied to new chunks, not existing chunks. So it's safe
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Why is backing up an unmodified FAT filesystem slow on Linux?
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By default, the files cache used by BorgBackup considers the inode of files.
When an inode number changes compared to the last backup, it hashes the file
again. The ``vfat`` kernel driver does not produce stable inode numbers by
default. One way to achieve stable inode numbering is mounting the filesystem
using ``nfs=nostale_ro``. Doing so implies mounting the filesystem read-only.
Another option is to not consider inode numbers in the files cache by passing
``--files-cache=ctime,size``.
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