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libfuse provides a fh field in the fuse_file_info struct which is passed to most functions
https://libfuse.github.io/doxygen/structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8

File handle id. May be filled in by filesystem in create, open, and opendir(). Available in most other file operations on the same file handle.

These are needed if you want to keep data consistent across chunked read()s or write()s where the data might be non-static for the path.
Adding overloads that provide at least the fh and an open() method in the Operations interface, as well as a close() for cleanup, would allow a wider range of applications than just static content per path.

I am attempting to following the directions to build the examples as per: https://github.com/dlang-community/dfuse#examples, however the following initial error is thrown:

(dmd-2.093.1)[alex@centos7full dfuse]$ make examples
make: *** No rule to make target `source/c/fuse/common.d', needed by `simplefs'.  Stop.
(dmd-2.093.1)[alex@centos7full dfuse]$ 

If the Makefile is then updated to read:

sources = source/c/fuse/fuse.d source/c/fuse/fuse_common.d source/dfuse/fuse.d

building the example binary still fails, but goes a little further:

(dmd-2.093.1)[alex@centos7full dfuse]$ make examples
dmd -w -debug -g -L-lfuse -ofsimplefs example/simplefs.d source/c/fuse/fuse.d source/c/fuse/fuse_common.d source/dfuse/fuse.d
source/c/fuse/fuse_common.d(11): Error: module fuse_opt is in file 'c/fuse/fuse_opt.d' which cannot be read
import path[0] = /home/alex/dlang/dmd-2.093.1/linux/bin64/../../src/phobos
import path[1] = /home/alex/dlang/dmd-2.093.1/linux/bin64/../../src/druntime/import
make: *** [simplefs] Error 1
(dmd-2.093.1)[alex@centos7full dfuse]$ 

Is it possible for you to update the project so that the examples can be built - or is there something else which I am missing?

e.g. I would like to intercept open calls (to track what files are accessed).
Is it also possible to just forward all not implemented functions to "normal" fs functions with the low-level API?.