to omit blobs that would not be not required for a sparse checkout on
the requested refs.
+
-The form '--filter=sparse:path=<path>' similarly uses a sparse-checkout
-specification contained in <path>.
-+
The form '--filter=tree:<depth>' omits all blobs and trees whose depth
from the root tree is >= <depth> (minimum depth if an object is located
at multiple depths in the commits traversed). <depth>=0 will not include
<commit> or an explicitly-given object. <depth>=2 is like <depth>=1
while also including trees and blobs one more level removed from an
explicitly-given commit or tree.
++
+Note that the form '--filter=sparse:path=<path>' that wants to read
+from an arbitrary path on the filesystem has been dropped for security
+reasons.
++
+Multiple '--filter=' flags can be specified to combine filters. Only
+objects which are accepted by every filter are included.
++
+The form '--filter=combine:<filter1>+<filter2>+...<filterN>' can also be
+used to combined several filters, but this is harder than just repeating
+the '--filter' flag and is usually not necessary. Filters are joined by
+'{plus}' and individual filters are %-encoded (i.e. URL-encoded).
+Besides the '{plus}' and '%' characters, the following characters are
+reserved and also must be encoded: `~!@#$^&*()[]{}\;",<>?`+'`+
+as well as all characters with ASCII code <= `0x20`, which includes
+space and newline.
++
+Other arbitrary characters can also be encoded. For instance,
+'combine:tree:3+blob:none' and 'combine:tree%3A3+blob%3Anone' are
+equivalent.
--no-filter::
Turn off any previous `--filter=` argument.